/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Copyright (c) 2023 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file has been modified by Huawei to verify type inference by adding verification statements.
*/

// === tests/cases/conformance/types/typeRelationships/instanceOf/narrowingConstrainedTypeVariable.ts ===
declare function AssertType(value:any, type:string):void;
// Repro from #20138

class C { }

function f1<T extends C>(v: T | string): void {
    if (v instanceof C) {
AssertType(v instanceof C, "boolean");
AssertType(v, "union");
AssertType(C, "typeof C");

        const x: T = v;
AssertType(x, "T");
AssertType(v, "T");
    }
    else {
        const s: string = v;
AssertType(s, "string");
AssertType(v, "string");
    }
}

class D { }

function f2<T extends C, U extends D>(v: T | U) {
    if (v instanceof C) {
AssertType(v instanceof C, "boolean");
AssertType(v, "union");
AssertType(C, "typeof C");

        const x: T = v;
AssertType(x, "T");
AssertType(v, "T");
    }
    else {
        const y: U = v;
AssertType(y, "U");
AssertType(v, "U");
    }
}

class E { x: string | undefined }

function f3<T extends E>(v: T | { x: string }) {
    if (v instanceof E) {
AssertType(v instanceof E, "boolean");
AssertType(v, "union");
AssertType(E, "typeof E");

        const x: T = v;
AssertType(x, "T");
AssertType(v, "T");
    }
    else {
        const y: { x: string } = v;
AssertType(y, "{ x: string; }");
AssertType(x, "string");
AssertType(v, "{ x: string; }");
    }
}


